Subaru Forester

1997-2005 of release

Repair and operation of the car

Subaru Forester
+ Subaru Forester cars
+ Maintenance instruction
+ Routine maintenance
+ Engine
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
- Control systems of the engine
   Specifications
   System of onboard diagnostics (OBD) - the principle of functioning and codes of malfunctions. Signals in chains of management
   ESM - the general information, assessment of a state and replacement
   Information sensors, the relay and actuation mechanisms - the general information
   System of catching of fuel evaporations (EVAP)
   System of recirculation of the fulfilled gases (EGR)
   System of the operated ventilation of a case (PCV)
   Conductor of a jellied mouth of the fuel tank
   The catalytic converter - the general information, check of a state and replacement
+ Gear shifting box
+ Coupling, transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

System of the operated ventilation of a case (PCV)

General information

The function chart of system of the operated ventilation of a case (PCV)

1  —  the Air inlet
2  —  the Delivery camera of an air path
3  —  the throttle Case
4  —  the Inlet pipeline
5  —  the PCV Valve
6  —  an engine Case
7  —  the valve Case
8  —  the Valve
9  —  Pruzhina

The PCV system serves for decrease in issue in the atmosphere of hydrocarbonic connections at the expense of a conclusion from the engine of crankcase gases. The purge of the block is carried out by a pro-race of the fresh air arriving from the air cleaner through a case in which it mixes up with the collected evaporations and the gases which broke from combustion chambers and is removed via the PCV valve in the inlet pipeline.

The PCV valve, hermetically closed cover of a jellied mouth of motive oil, air inlet and set of connecting vacuum hoses are among the main components of system.

For the purpose of maintenance of stability of turns of idling the PCV valve blocks a purge stream at deep depression in the inlet pipeline. In case of violation of serviceability of functioning of the engine (as, for example, at wear of piston rings) the system makes withdrawal of excess of crankcase gases through a ventilating tube back in the air cleaner and their reburning in combustion chambers.

Intake of crankcase gases in the engine is carried out via the case of a throttle which begins to become covered by tarry deposits, in particular around an arrangement of a butterfly valve over time. In view of told, it is necessary to make cleaning of the case of a throttle from time to time.

Check

Principle of functioning of the PCV valve

1  —  an air inlet Sleeve
2  —  the Inlet pipeline
3  —  the PCV Valve
4  —  an engine Case

PERFORMANCE ORDER

1. Attentively examine all hoses and nipple connections of a path of PCV on existence of signs of development of leaks. By a purge check passability of hoses.
2. Estimate reliability of landing of a cover of a jellied mouth of motive oil, check whether there are no signs of development of leaks through its laying.
3. Disconnect a vacuum hose from the PCV valve.
4. Remove the valve and carefully wipe it.
5. Shake the PCV valve, - correct assembly when stirring has to publish a crash, - in case of need make replacement.
6. The principle of functioning of the PCV valve is explained on an accompanying illustration. Start the engine on single turns and press a finger to an opening in the valve, - in assembly depression has to take place. If depression is not felt, at first check passability of a vacuum hose, then (if a hose as it should be) replace the valve.

The PCV valve - the general information and replacement

Principle of functioning

Location of the PCV valve of a pokazanoa

As it was already told above, the system of the operated ventilation of a case (PCV) serves for prevention of issue in the atmosphere of crankcase gases. The problem is solved by means of installation in the inlet pipeline of the special PCV valve.

At partial opening of a butterfly valve crankcase gases (via the PCV valve) and the filtered air are soaked up directly in the inlet pipeline by the deep depression created in it. At completely open gate when depression depth in the pipeline is small, a part of crankcase gases goes to the air cleaner and then are soaked up in the engine via the throttle case.

Principle of functioning of the PCV system

1  —  an air inlet Sleeve
2  —  the throttle Case
3  —  the PCV Valve
4  —  the Head of cylinders
5  —  the Block of cylinders

Replacement

PERFORMANCE ORDER

1. Disconnect the hose brought to it from the PCV valve.

2. Having turned the valve counterclockwise, take it from the landing nest in the inlet pipeline.

3. Installation is made upside-down. Track that the valve was tightened with the required effort (20 ÷ 35 Nanometers), do not forget to connect a vacuum hose.
4. Having pulled vertically up, take the valve from the rubber landing plug. Estimate a plug condition, in case of need make replacement.
5. If the valve is hammered with tarry deposits, also the probability of violation of passability of a connecting hose is not excluded, - remove a hose and wash out it solvent.
6. Having washed out a hose, check it for existence of signs of aging of material and mechanical damages. Track reliability of fixing of a hose on reception unions.
7. In case of need make replacement of the PCV valve.